In book ten, the gang witness the horror of a house going up in flames. Then there's the theft of a very valuable violin. Are the two incidents connected? The Seven mean to use all their detective know-how to find out!...Solve the mystery!

Cover and inside illustrations are by the brilliant Tony Ross, illustrator of David Walliams's books. The story was first published in 1951. This edition features the classic text and comes with a Bonus Blyton section at the back with quizzes, puzzles and other bonus extras!